JP2007301792A - Injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection molding machine improved in maintenance properties. <P>SOLUTION: In the injection molding machine 1 equipped with a toggle link mechanism 15 for performing mold clamping by a mold clamping drive means 8 for opening and closing a mold, roll bearings 30 equipped with a solid lubricating members 33 impregnated with a lubricant are interposed between the connection parts of a plurality of the link arms 21, 22, 23 and 24 connected to the toggle link mechanism 15 in a freely revolvable manner. Accordingly, the lubricant is leached from the solid lubricating members 33 accompanied by the extending and bending operation of a plurality of the link arms 21, 22, 23 and 24 connected in the freely revolvable manner to smoothly operate the link arms 21, 22, 23 and 24. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an injection molding machine including a toggle link mechanism for amplifying a mold clamping force of a mold.

  Conventionally, a toggle link mechanism for amplifying the mold clamping force of a mold provided in an injection molding machine has a plurality of link arms, and in order to connect these link arms to each other in a freely rotatable manner, Rolling bearings are used. In Patent Document 1, a communication path is provided in which a sliding surface of a link support portion that rotatably supports each link of a link device such as a toggle mold clamping device is communicated in a sealed state, and each lubricant is supplied through the communication path. A link device such as a toggle mold clamping device is disclosed in which each link can be smoothly operated by being supplied while being circulated to the sliding surface of the link support portion. Further, in Patent Document 2, a rolling bearing is inserted into a pivot, and two members of a joint corresponding to a link arm are connected to each other via the pivot so as to be rotatable with respect to each other. A toggle mechanism of an injection molding machine that supplies lubricating oil is disclosed.

JP-A-6-71412 Japanese Patent Laid-Open No. 11-10690

  However, in Patent Document 1, a supply means and a communication path for circulating the lubricant must be provided, and the structure becomes complicated. Also in Patent Document 2, a supply hole for supplying lubricating oil to the sliding surface of the link support portion must be provided, and since the lubricating oil is supplied from the supply hole to the sliding surface, When a large amount of lubricating oil is supplied, there is a concern that the lubricating oil supplied with the operation of the toggle mechanism will come out of the gap between the sliding surfaces and scatter and stain the surroundings.

  The present invention has been made in view of the above problems, and an object thereof is to provide an injection molding machine that is improved in maintenance such as maintenance and inspection.

  An injection molding machine according to claim 1 is a mold clamping drive means having a drive source for opening and closing a mold, a support member on which the mold clamping drive means is mounted, and a fixed die plate to which a fixed side mold is attached. A fixed die plate, a tie bar installed on the support member, a movable die plate attached to a movable mold guided by the tie bar and advanced / retracted in a mold opening / closing direction, and the movable die plate is advanced / retracted and the mold clamping is performed. An injection molding machine comprising a toggle link mechanism that amplifies the thrust generated by the drive means to a larger force and clamps the mold, and is configured to be pivotally connected to the toggle link mechanism. A rolling bearing provided with a solid lubricating member is interposed in a connection portion of a plurality of link arms.

  According to the configuration of the first aspect, the injection molding machine is operated, and the movable side mold attached to the movable die plate is advanced and retracted by the mold clamping driving means with respect to the fixed side mold attached to the fixed die plate. As a result, the plurality of link arms that are rotatably connected are extended and bent. In this case, by interposing a rolling bearing provided with a solid lubricant member in the connection portion of the link arm, as in the past, without supplying the lubricant from the supply means and the communication path for circulating the lubricant, The link arm can be operated smoothly. For example, even if the injection molding machine is operated for a long period of time, the maintenance work for the lubricant can be omitted.

  An injection molding machine according to a second aspect is the injection molding machine according to the first aspect, wherein the solid lubricating member is obtained by impregnating a synthetic resin body with a lubricant.

  According to the configuration of the second aspect, the lubricant exudes from the synthetic resin body and effectively lubricates the connecting portion of the link arm by the rotation operation of the rolling bearing that operates according to the extension and bending operation of the link arm. it can.

  An injection molding machine according to a third aspect of the present invention is the injection molding machine according to the first aspect, wherein the solid lubricating member is a mixture of lubricating oil and a powder of ultra high molecular weight polyethylene or the like.

  According to the configuration of claim 3, the solid lubricating member is obtained by heat-treating a lubricant obtained by mixing a powder of ultrahigh molecular weight polyethylene or the like into a lubricant, and an appropriate amount ratio of the powder and the lubricant. By mixing and solidifying with, it is possible to adjust the amount of lubricant oozing out from the solid lubricating member due to factors such as the link arm's extension and bending operation speed, and the link arm connection part can be adjusted. It can be effectively lubricated.

  An injection molding machine according to claim 1 is a mold clamping drive means having a drive source for opening and closing a mold, a support member on which the mold clamping drive means is mounted, and a fixed die plate to which a fixed side mold is attached. A fixed die plate, a tie bar installed on the support member, a movable die plate attached to a movable mold guided by the tie bar and advanced / retracted in a mold opening / closing direction, and the movable die plate is advanced / retracted and the mold clamping is performed. An injection molding machine comprising a toggle link mechanism that amplifies the thrust generated by the drive means to a larger force and clamps the mold, and is configured to be pivotally connected to the toggle link mechanism. Since the rolling bearing provided with the solid lubricating member is interposed at the connecting portions of the plurality of link arms, the conventional supply means for circulating the lubricant becomes unnecessary, and the main tenn The burden of the work can be greatly reduced.

  The injection molding machine according to claim 2 is the injection molding machine according to claim 1, wherein the solid lubricating member is obtained by impregnating a synthetic resin body with a lubricant, and effectively lubricates the connection portion. Can do.

  An injection molding machine according to a third aspect is the injection molding machine according to the first aspect, wherein the solid lubricating member is obtained by mixing a powder of ultrahigh molecular weight polyethylene or the like with lubricating oil, and the solid lubricating member Since the lubricant mixed with a powder of ultra-high molecular weight polyethylene or the like is heat-treated and solidified, for example, by mixing powdered polyethylene and a lubricant such as grease in an appropriate amount ratio, It is possible to adjust the amount of lubricant that exudes from the solid lubricating member, and it is possible to prevent excessive lubricant exceeding a predetermined amount from extruding from the solid lubricating member and scattering to the surroundings.

  Embodiments as the best mode for carrying out the present invention will be described below with reference to FIGS. Of course, it goes without saying that the present invention can be easily applied to other than those described in the embodiments without departing from the spirit of the invention.

  1 to 5 show an example of the present invention, FIG. 1 is a front view showing an injection molding machine, FIG. 2 is an enlarged front view showing a state in which a link arm of a toggle link mechanism is extended, and FIG. 3 is a toggle link mechanism. FIG. 4 is a perspective view showing a rolling bearing, and FIG. 5 is a cross-sectional view showing the rolling bearing.

  The injection molding machine will be described below based on FIG. The injection molding machine 1 includes an injection unit 5 for injecting molten resin into a cavity 4 formed by a fixed mold 2 and a movable mold 3, and a movable die plate 7 to which the movable mold 3 is fixed. A mold clamping drive means 8 having a drive source for advancing and retreating in the mold opening and closing direction, a support member 10 for supporting the mold clamping drive means 8, a fixed die plate 11 to which the fixed mold 2 is fixed, a fixed die plate 11 and a support A columnar tie bar 12 is provided on the member 10 to guide the movable mold 3 in the mold opening / closing direction, and a toggle link mechanism 15 for amplifying the mold clamping force generated by the mold clamping driving means 8 to a larger force. ing. In addition, since the injection molding machine 1 of a present Example has the structure substantially the same as a well-known injection molding machine, the detail is abbreviate | omitted about the part which is not the summary of this invention.

  Next, the toggle link mechanism 15 will be described below with reference to FIGS. The plurality of link arms 21, 22, 23, 24 configured in the toggle link mechanism 15 has a rolling bearing 30 fixed to the end portions in the longitudinal direction of the link arms 21, 22, 23, 24. The outer ring 32 of the bearing 30 and the cylindrical toggle pin 31 inserted through the rolling bearing 30 are connected to each other so as to be rotatable. One end side (left side in FIG. 2) of the link arms 21 and 22 and the link arms 23 and 24 connected to each other is a toggle pin in which the link arms 21 and 23 are fixed to the support member 10 via the rolling bearing 30. The other end side (the right side in FIG. 2) of the other side is connected to a toggle pin 31 to which the link arms 22 and 24 are fixed to the movable die plate 7 via a rolling bearing 30. By being connected rotatably, mold clamping (mold closing) and mold opening operations are performed by extending and bending the link arms 21, 22, 23, 24. More specifically, The movable side mold 3 fixed to the movable die plate 7 is moved forward and backward by the mold clamping driving means 8 with respect to the fixed side mold 2 fixed to the fixed die plate 11, and the link arms 21 and 22 shown in FIG. , A mold clamping state of the stretched mold 3,24, producing conducted moldings repeated mold open state of the mold by bending a link arm 21, 22, 23 and 24 shown in FIG.

  Next, the rolling bearing will be described with reference to FIGS. A solid lubricating member 33 impregnated with a lubricant such as grease is provided on the inner peripheral surface side of the cylindrical outer ring 32 of the rolling bearing 30, and cylindrical needle rollers 34 are arranged at equal intervals in the circumferential direction. As shown in FIG. 5, the above-described toggle pin 31 is inserted while being in contact with the needle roller 34 of the rolling bearing 30.

  In the toggle link mechanism 15 of the injection molding machine 1 configured as described above, when the injection molding machine 1 is in operation, the link arms 21, 22, 23, 24 connected to each other repeatedly roll and expand. By providing the bearing 30 with a solid lubricating member 33 that is solidified by mixing a lubricant, the inner surface of the outer ring 32 of the toggle pin 31 and the rolling bearing 30 and the needle that rotates as the outer ring 32 rotates. Lubrication of the contact portion with the roller 34 is caused by friction between the needle roller 34 and the solid lubrication member 33 that is rotated by the rotation of the rolling bearing 30 that accompanies expansion and bending of the link arms 21, 22, 23, 24. Is carried out by oozing out from the solid lubricating member 33. Therefore, the wear of the connecting portions of the link arms 21, 22, 23, 24 can be suppressed, and the lubricant is continuously or periodically supplied to the sliding portions of the members as in the prior art. Becomes unnecessary, and it becomes possible to simplify troublesome inspection work of the lubricant. In addition, since the lubrication of the connecting portion is performed by the leakage of the lubricant, the lubricant is not supplied excessively, and the lubricant is scattered around the toggle link mechanism 15 and its surroundings as in the past. It can prevent getting dirty.

  In addition, since the solid lubricant member 33 is obtained by heat-treating (firing) a mixture of a lubricant such as a powder of ultra-high molecular weight polyethylene and the like, for example, a suitable amount of powdered polyethylene and a lubricant such as grease can be used. It is possible to adjust the amount of the lubricant oozing out from the solid lubricating member 33 due to factors such as the extension and bending operation speeds of the link arms 21, 22, 23, and 24. Therefore, it is possible to effectively lubricate the connecting parts of the link arms 21, 22, 23, 24 so that the lubricant is not interrupted, and excessive lubricant exceeding a predetermined amount oozes out and scatters around. Can also be prevented.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to the said Example, A various deformation | transformation implementation is possible within the range of the summary of this invention. In this embodiment, the toggle pin 31 is configured to be in direct contact with the needle roller 34. However, the present invention is not limited to this, and the toggle pin 31 and the toggle pin 31 are arranged with another member interposed between the toggle pin 31 and the needle roller 34. You may make it contact the needle roller 34 indirectly. Further, the solid lubricating member 33 of the present embodiment is solidified by baking a mixture of a lubricant and a powder of polyethylene or the like at a high temperature. However, the solid lubricating member 33 is not limited to this, and the synthetic lubricating member 33 is a synthetic resin. The body may be impregnated with a liquid lubricant.

It is a front view of the injection molding machine which shows an example of this invention. It is an enlarged front view which shows the state which extended the link arm of the toggle link mechanism same as the above. It is an enlarged front view which shows the state which bent the link arm of the toggle link mechanism same as the above. It is a perspective view which shows a rolling bearing same as the above. It is sectional drawing which shows a rolling bearing same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Injection molding machine 2 Fixed side metal mold 3 Movable side metal mold 7 Movable die plate 8 Mold clamping drive means 10 Support member 11 Fixed die plate 12 Tie bar 15 Toggle link mechanism 21, 22, 23, 24 Link arm 30 Rolling bearing 33 Solid Lubrication member

Claims (3)

  A mold clamping drive means having a drive source for opening and closing the mold, a support member mounted with the mold clamping drive means, a fixed die plate to which a fixed mold is attached, the fixed die plate and the support member A tie bar installed, a movable die plate that is guided by the tie bar and attached to a movable mold that advances and retreats in the mold opening and closing direction, and the movable die plate is advanced and retracted and the thrust generated by the mold clamping driving means is increased. A toggle link mechanism that amplifies the mold and clamps the mold, and is connected to a connecting portion of a plurality of link arms that are rotatably connected to the toggle link mechanism. An injection molding machine comprising a rolling bearing provided with a lubricating member.   The injection molding machine according to claim 1, wherein the solid lubricating member is obtained by impregnating a synthetic resin body with a lubricant. 2. The injection molding machine according to claim 1, wherein the solid lubricating member is obtained by mixing a powder of ultrahigh molecular weight polyethylene or the like with lubricating oil.

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